Incorporation of Chlorine in a Secondary Steelmaking Slag Based on the CaO-Al_2O_3-SiO_2 System

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概要

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• CaO-Al<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB>=50-42-8% by weight (wt%) eutectic slags, similar in composition to a secondary steelmaking slag, containing 1-15 wt% CaCl<SUB>2</SUB> were heated to 1798 K. DTA was performed and the system was cooled. Samples were characterized by electron microprobe and X-ray powder diffraction. Four main crystalline phases were present, CaO·Al<SUB>2</SUB>O<SUB>3</SUB>, 2CaO·Al<SUB>2</SUB>O<SUB>3</SUB>·SiO<SUB>2</SUB>, β-2CaO·SiO<SUB>2</SUB> and 11CaO·7Al<SUB>2</SUB>O<SUB>3</SUB>·CaCl<SUB>2</SUB>. The chlorine phase was very similar to the mayenite phase (12CaO·7Al<SUB>2</SUB>O<SUB>3</SUB>). It formed first at 1321 (±27) K and remained solid as a separate phase because of its high melting point. The rest of the system, upon cooling, crystallized according to the well-known CaO-Al<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB> phase diagram. It was seen that if chlorine is present in sufficient amounts (greater than 4.9 wt%), the chlorine phase constitutes 92 wt% of the final slag. Also when the chlorine phase was less than 92 wt% in the final slag, the recovery of chlorine exceeded 90%. For comparison, CaO-Al<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB>=48-12-40 wt% representing an ironmaking slag, was mixed with 10.0 wt% CaCl<SUB>2</SUB> and also similarly heated and characterized after cooling. The phases observed were 2CaO·Al<SUB>2</SUB>O<SUB>3</SUB>·SiO<SUB>2</SUB> and two new chlorine phases, all of which were glassy.

• 社団法人 日本鉄鋼協会の論文
• 1996-09-15

著者

• PAL Uday

  Department of Manufacturing Engineering, Boston University

• CHOU Kuo-Chih

  Department of Material Science and Engineering, Shanghai University

• Chou Kuo-chih

  Department Of Materials Science And Engineering Massachusetts Institute Of Technology

• Patsiogiannis Filippos

  Energy Systems Division Argonne National Laboratory

• PAL Uday

  Department of Materials Science and Engineering, Massachusetts Institute of Technology

関連論文

• Rate of Reduction of Ferric and Ferrous Oxide from Calcia-Silica-Alumina Slag by Carbon in Luquid Iron
• Incorporation of Sulfur in an Optimized Ladle Steelmaking Slag
• Quantitative investigation of the oxidation kinetics of magnesia/carbon composite
• Incorporation of Chlorine in a Secondary Steelmaking Slag Based on the CaO-Al_2O_3-SiO_2 System
• Estimation of Sulfide Capacities of Multicomponent Slags using Optical Basicity
• Removal of FeO during Foaming of CaO-Al2O3-SiO2-FeO Slags by Low Carbon-Iron Melts.
• Laboratory Scale Refining Studies on Low Carbon Aluminum Killed Steels Using Synthetic Fluxes.

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